/**************************************************************************** * pexec.c * * Copyright (C) 200-2009 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include "keywords.h" #include "pdefs.h" #include "pinsn16.h" #include "pfdefs.h" #include "pxdefs.h" #include "pedefs.h" #include "paslib.h" #include "pexec.h" #ifdef CONFIG_HAVE_LIBM #include #endif /**************************************************************************** * Definitions ****************************************************************************/ #define PTRUE ((ustack_t)-1) #define PFALSE ((ustack_t) 0) /**************************************************************************** * Macros ****************************************************************************/ /* Remove the value from the top of the stack */ #define POP(st, dest) \ do { \ dest = (st)->dstack.i[BTOISTACK((st)->sp)]; \ (st)->sp -= BPERI; \ } while (0) /* Add the value to top of the stack */ #define PUSH(st, src) \ do { \ (st)->sp += BPERI; \ (st)->dstack.i[BTOISTACK((st)->sp)] = src; \ } while (0) /* Return an rvalue for the (word) offset from the top of the stack */ #define TOS(st, off) \ (st)->dstack.i[BTOISTACK((st)->sp)-(off)] /* Save the src (word) at the dest (word) stack position */ #define PUTSTACK(st, src, dest) \ do { \ (st)->dstack.i[BTOISTACK(dest)] = src; \ } while (0) /* Return an rvalue for the (word) from the absolute stack position */ #define GETSTACK(st, src) \ (st)->dstack.i[BTOISTACK(src)] /* Store a byte to an absolute (byte) stack position */ #define PUTBSTACK(st, src,dest) \ do { \ (st)->dstack.b[dest] = dest; \ } while (0) /* Return an rvalue for the absolute (byte) stack position */ #define GETBSTACK(st, src) \ (st)->dstack.b[src] /* Return the address for an absolute (byte) stack position. */ #define ATSTACK(st, src) \ &(st)->dstack.b[src] /* Discard n words from the top of the stack */ #define DISCARD(st, n) \ do { \ (st)->sp -= BPERI*(n); \ } while (0) /* Release a C string */ #define free_cstring(a) \ free(a) /**************************************************************************** * Private Type Definitions ****************************************************************************/ union fparg_u { double f; uint16_t hw[4]; }; typedef union fparg_u fparg_t; /**************************************************************************** * Private Function Prototypes ****************************************************************************/ static uint16_t pexec_sysio(struct pexec_s *st, uint8_t fno, uint16_t subfunc); static uint16_t pexec_libcall(struct pexec_s *st, uint16_t subfunc); static uint16_t pexec_execfp(struct pexec_s *st, uint8_t fpop); static void pexec_getfparguments(struct pexec_s *st, uint8_t fpop, fparg_t *arg1, fparg_t *arg2); static ustack_t pexec_readinteger(uint8_t *ioptr); static void pexec_readreal(uint16_t *dest, uint8_t *ioptr); static ustack_t pexec_getbaseaddress(struct pexec_s *st, level_t leveloffset); static uint8_t *pexec_mkcstring(uint8_t *buffer, int buflen); /**************************************************************************** * Private Variables ****************************************************************************/ static uint8_t ioline[LINE_SIZE+1]; /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: pexec_sysio * * Description: * This function process a system I/O operation. * ****************************************************************************/ static uint16_t pexec_sysio(struct pexec_s *st, uint8_t fno, uint16_t subfunc) { ustack_t uparm1; fparg_t fp; uint8_t *ptr; switch (subfunc) { case xEOF : /* FINISH ME -- > */ break; case xEOLN : /* FINISH ME -- > */ break; case xRESET : /* FINISH ME -- > */ break; case xREWRITE : /* FINISH ME -- > */ break; case xREADLN : /* FINISH ME -- > */ break; case xREAD_BINARY : /* FINISH ME -- > */ break; /* xREAD_INT: * STACK INPUTS: TOS(st, 0) = address to store integer */ case xREAD_INT : (void)fgets((char*)ioline, LINE_SIZE, stdin); PUTSTACK(st, pexec_readinteger(ioline),TOS(st, 0)); break; /* xREAD_CHAR: * STACK INPUTS: TOS(st, 0) = address to store integer */ case xREAD_CHAR: (void)fgets((char*)ioline, LINE_SIZE, stdin); PUTBSTACK(st, ioline[0],TOS(st, 0)); break; /* XREAD_STRING: * STACK INPUTS: * TOS = Number of bytes to read * TOS-1 = Address to store byte(s) */ case xREAD_STRING : (void)fgets((char*)ATSTACK(st, TOS(st, 1)), TOS(st, 0), stdin); break; /* xREAD_REAL: * STACK INPUTS: TOS = address to store REAL */ case xREAD_REAL : (void)fgets((char*)ioline, LINE_SIZE, stdin); pexec_readreal((uint16_t*)ATSTACK(st, TOS(st, 0)), ioline); break; case xWRITELN : putchar('\n'); break; case xWRITE_PAGE : putchar('\f'); break; case xWRITE_BINARY : /* FINISH ME -- > */ break; /* xWRITE_INT: * STACK INPUTS: TOS = integer value to write. */ case xWRITE_INT : printf("%ld", signExtend16(TOS(st, 0))); break; /* xWRITE_CHAR: * STACK INPUTS: TOS = char value to write. */ case xWRITE_CHAR : putchar(TOS(st, 0)); break; /* xWRITE_STRING: * STACK INPUTS: * TOS = Number of bytes to write * TOS-1 = Address of src data */ case xWRITE_STRING : uparm1 = TOS(st, 0); for (ptr = (uint8_t*)ATSTACK(st, TOS(st, 1)); uparm1; uparm1--, ptr++) putchar(*ptr); break; /* xWRITE_REAL: * STACK INPUTS: TOS = value of double */ case xWRITE_REAL : fp.hw[0] = TOS(st, 3); fp.hw[1] = TOS(st, 2); fp.hw[2] = TOS(st, 1); fp.hw[3] = TOS(st, 0);; printf("%f", fp.f); break; default : return eBADSYSIOFUNC; } return eNOERROR; } /* end pexec_sysio */ /**************************************************************************** * Name: pexec_libcall * * Description: * This function process a system I/O operation * ****************************************************************************/ static uint16_t pexec_libcall(struct pexec_s *st, uint16_t subfunc) { ustack_t uparm1; ustack_t uparm2; paddr_t addr1; paddr_t addr2; uint16_t *tmp; uint16_t *ref; uint8_t *src; uint8_t *dest; uint8_t *name; int len; int32_t value; switch (subfunc) { /* Get the value of an environment string * * ON INPUT: * TOS(st, 0) = Number of bytes in environment identifier string * TOS(st, 1) = Address environment identifier string * ON RETURN (above replaced with): * TOS(st, 0) = MS 16-bits of 32-bit C string pointer * TOS(st, 1) = LS 16-bits of 32-bit C string pointer */ case lbGETENV : len = TOS(st, 0); /* Number of bytes in string */ src = (uint8_t*)&GETSTACK(st, TOS(st, 1)); /* Pointer to string */ /* Make a C string out of the pascal string */ name = pexec_mkcstring(src, len); if (name == NULL) { return eNOMEMORY; } /* Make the C-library call and free the string copy */ src = (uint8_t*)getenv((char*)name); free_cstring(name); /* Save the returned pointer in the stack */ TOS(st, 0) = (ustack_t)((uint32_t)src >> 16); TOS(st, 1) = (ustack_t)((uint32_t)src & 0x0000ffff); break; /* Copy pascal string to a pascal string * * ON INPUT: * TOS(st, 0) = address of dest string hdr * TOS(st, 1) = length of source string * TOS(st, 2) = pointer to source string * ON RETURN (input consumed): */ case lbSTR2STR : /* "Pop" in the input parameters from the stack */ POP(st, addr1); /* addr of dest string header */ POP(st, uparm1); /* length of source data */ POP(st, addr2); /* addr of source string data */ /* Do nothing if the source and destinations are the same * string. This happens normally on cases like: * string name; * char c; * name := name + c; */ if (addr1 != addr2) { /* The source and destination strings are different. * Make sure that the string length will fit into the destination. */ if (uparm1 >= sSTRING_MAX_SIZE) { /* Clip to the maximum size */ uparm1 = sSTRING_MAX_SIZE; len = sSTRING_MAX_SIZE; } else { /* We have space */ len = (int)uparm1; } /* Get proper string pointers */ dest = ATSTACK(st, addr1); src = ATSTACK(st, addr2); /* Transfer the (16-bit) string length (must be aligned!) */ tmp = (uint16_t*)dest; *tmp++ = uparm1; dest = (uint8_t*)tmp; /* Then transfer the string contents */ memcpy(dest, src, len); } break; /* Copy C string to a pascal string * * ON INPUT: * TOS(st, 0) = address of dest hdr * TOS(st, 1) = MS 16-bits of 32-bit C string pointer * TOS(st, 2) = LS 16-bits of 32-bit C string pointer * ON RETURN (input consumed): */ case lbCSTR2STR : /* "Pop" in the input parameters from the stack */ POP(st, addr1); /* addr of dest string header */ POP(st, uparm1); /* MS 16-bits of 32-bit C string pointer */ POP(st, uparm2); /* LS 16-bits of 32-bit C string pointer */ /* Get proper string pointers */ dest = ATSTACK(st, addr1); src = (uint8_t*)((unsigned long)uparm1 << 16 | (unsigned long)uparm2); /* Handle null src pointer */ if (src == NULL) { *dest = 0; } else { /* Get the length of the string */ uparm1 = strlen((char*)src); /* Make sure that the string length will fit into the * destination. */ if (uparm1 >= sSTRING_MAX_SIZE) { /* Clip to the maximum size */ uparm1 = sSTRING_MAX_SIZE; len = sSTRING_MAX_SIZE; } else { /* We have space */ len = (int)uparm1; } /* Transfer the (16-bit) string length (must be aligned!) */ tmp = (uint16_t*)dest; *tmp++ = uparm1; dest = (uint8_t*)tmp; /* Then transfer the string contents */ memcpy(dest, src, len); } break; /* Copy pascal string to a pascal string reference * procedure str2rstr(src : string; var dest : rstring) * ON INPUT: * TOS(st, 0)=address of dest string reference * TOS(st, 1)=length of source string * TOS(st, 2)=pointer to source string * ON RETURN: actual parameters released. */ case lbSTR2RSTR : /* "Pop" in the input parameters from the stack */ POP(st, addr1); /* addr of dest string reference */ POP(st, uparm1); /* length of source data */ POP(st, addr2); /* addr of source string data */ /* Make sure that the string length will fit into the destination. */ if (uparm1 >= sSTRING_MAX_SIZE) { return eSTRSTKOVERFLOW; } /* Get a pointer to the destination reference */ ref = (uint16_t*)ATSTACK(st, addr1); /* Get proper string pointers */ dest = ATSTACK(st, ref[0] - 2); src = ATSTACK(st, addr2); /* Transfer the (16-bit) string length (must be aligned!) */ tmp = (uint16_t*)dest; *tmp++ = uparm1; dest = (uint8_t*)tmp; /* Then transfer the string contents and save the new size */ memcpy(dest, src, uparm1); ref[1] = uparm1; break; /* Copy C string to a pascal string reference * procedure cstr2str(src : cstring; var dest : string) * ON INPUT: * TOS(st, 0)=address of dest string reference * TOS(st, 0)=MS 16-bits of 32-bit C source string pointer * TOS(st, 1)=LS 16-bits of 32-bit C source string pointer * ON RETURN: actual parameters released */ case lbCSTR2RSTR : /* "Pop" in the input parameters from the stack */ POP(st, addr1); /* addr of dest string reference */ POP(st, uparm1); /* MS 16-bits of 32-bit C string pointer */ POP(st, uparm2); /* LS 16-bits of 32-bit C string pointer */ /* Get a pointer to the destination reference */ ref = (uint16_t*)ATSTACK(st, addr1); /* Get proper string pointers */ dest = ATSTACK(st, ref[0] - 2); src = (uint8_t*)((unsigned long)uparm1 << 16 | (unsigned long)uparm2); /* Handle null src pointer */ if (src == NULL) { *dest = 0; } else { /* Get the length of the string */ uparm1 = strlen((char*)src); /* Make sure that the string length will fit into the * destination. */ if (uparm1 >= sSTRING_MAX_SIZE) { return eSTRSTKOVERFLOW; } /* Transfer the (16-bit) string length (must be aligned!) */ tmp = (uint16_t*)dest; *tmp++ = uparm1; dest = (uint8_t*)tmp; /* Then transfer the string contents */ memcpy(dest, src, uparm1); ref[1] = uparm1; } break; /* Convert a string to a numeric value * procedure val(const s : string; var v; var code : word); * * Description: * val() converts the value represented in the string S to a numerical * value, and stores this value in the variable V, which can be of type * Longint, Real and Byte. If the conversion isn't succesfull, then the * parameter Code contains the index of the character in S which * prevented the conversion. The string S is allowed to contain spaces * in the beginning. * * The string S can contain a number in decimal, hexadecimal, binary or * octal format, as described in the language reference. * * Errors: * If the conversion doesn¡Çt succeed, the value of Code indicates the * position where the conversion went wrong. * * ON INPUT * TOS(st, 0)=address of code * TOS(st, 1)=address of value * TOS(st, 2)=length of source string * TOS(st, 3)=pointer to source string * ON RETURN: actual parameters released */ case lbVAL : /* Get the string information */ len = TOS(st, 2); /* Number of bytes in string */ src = (uint8_t*)&GETSTACK(st, TOS(st, 3)); /* Pointer to string */ /* Make a C string out of the pascal string */ name = pexec_mkcstring(src, len); if (name == NULL) { return eNOMEMORY; } /* Convert the string to an integer */ value = atoi((char*)name); if ((value < MININT) || (value > MAXINT)) { return eINTEGEROVERFLOW; } PUTSTACK(st, TOS(st, 0), 0); PUTSTACK(st, TOS(st, 1), value); DISCARD(st, 4); break; /* Create an empty string * function mkstk : string; * ON INPUT * ON RETURN * TOS(st, 0)=length of new string * TOS(st, 1)=pointer to new string */ case lbMKSTK : /* Allocate space on the string stack for the new string * FIXME: This logic does not handle strings with other than the * default size! */ addr1 = ((st->csp + 1) & ~1); st->csp += sSTRING_SIZE; /* Allocate max size */ /* Save the length at the beginning of the copy */ tmp = (uint16_t*)&GETSTACK(st, addr1); /* Pointer to new string */ *tmp++ = 0; /* Save current size */ /* Update the stack content */ PUSH(st, addr1 + sSTRING_HDR_SIZE); /* Pointer to new string */ PUSH(st, 0); /* Current size */ break; /* Replace a string with a duplicate string residing in allocated * string stack. * function mkstkstr(name : string) : string; * ON INPUT * TOS(st, 0)=length of original string * TOS(st, 1)=pointer to original string data * ON RETURN * TOS(st, 0)=length of new string (unchanged) * TOS(st, 1)=pointer to new string data */ case lbMKSTKSTR : /* Get the parameters from the stack (leaving the string reference * in place. */ uparm1 = TOS(st, 0); /* Original string size */ addr1 = TOS(st, 1); /* Original string data pointer */ /* Check if there is space on the string stack for the new string * FIXME: This logic does not handle strings with other than the * default size! */ if (st->csp + sSTRING_SIZE >= st->spb) { return eSTRSTKOVERFLOW; } /* Allocate space on the string stack for the new string */ addr2 = ((st->csp + 1) & ~1); st->csp += sSTRING_SIZE; /* Allocate max size */ /* Save the length at the beginning of the copy */ tmp = (uint16_t*)&GETSTACK(st, addr2); /* Pointer to new string */ *tmp++ = uparm1; /* Save current size */ dest = (uint8_t*)tmp; /* Pointer to string data */ /* Copy the string into the string stack */ src = (uint8_t*)&GETSTACK(st, addr1); /* Pointer to original string */ memcpy(dest, src, uparm1); /* Update the stack content */ TOS(st, 1) = addr2 + sSTRING_HDR_SIZE; break; /* Replace a character with a string residing in allocated string stack. * function mkstkc(c : char) : string; * ON INPUT * TOS(st, 0)=Character value * ON RETURN * TOS(st, 0)=length of new string * TOS(st, 1)=pointer to new string */ case lbMKSTKC : /* Check if there is space on the string stack for the new string * FIXME: This logic does not handle strings with other than the * default size! */ if (st->csp + sSTRING_SIZE >= st->spb) { return eSTRSTKOVERFLOW; } /* Allocate space on the string stack for the new string */ addr2 = ((st->csp + 1) & ~1); st->csp += sSTRING_SIZE; /* Allocate max size */ /* Save the length at the beginning of the copy */ tmp = (uint16_t*)&GETSTACK(st, addr2); /* Pointer to new string */ *tmp++ = 1; /* Save initial size */ dest = (uint8_t*)tmp; /* Pointer to string data */ /* Copy the character into the string stack */ *dest++ = TOS(st, 0); /* Save character as string */ /* Update the stack content */ TOS(st, 0) = addr2 + sSTRING_HDR_SIZE; /* String address */ PUSH(st, 1); /* String length */ break; /* Concatenate a string to the end of a string. * function strcat(name : string, c : char) : string; * * ON INPUT * TOS(st, 0)=length of string1 * TOS(st, 1)=pointer to string1 data * TOS(st, 2)=length of string2 * TOS(st, 3)=pointer to string2 data * ON OUTPUT * TOS(st, 1)=new length of string2 * TOS(st, 2)=pointer to string2 */ case lbSTRCAT : /* Get the parameters from the stack (leaving the string reference * in place. */ POP(st, uparm1); /* string1 size */ POP(st, addr1); /* string1 data stack addr */ uparm2 = TOS(st, 0); /* string2 size */ /* Check for string overflow. FIXME: This logic does not handle * strings with other than the default size! */ if (uparm1 + uparm2 > sSTRING_MAX_SIZE) return eSTRSTKOVERFLOW; else { /* Get a pointer to string1 data */ src = ATSTACK(st, addr1); /* Get a pointer to string2 header, set new size then, get * a pointer to string2 data. */ tmp = ((uint16_t*)&GETSTACK(st, TOS(st, 1))) - 1; *tmp++ = uparm1 + uparm2; dest = (uint8_t*)tmp; memcpy(&dest[uparm2], src, uparm1); /* cat strings */ TOS(st, 0) = uparm1 + uparm2; /* Save new size */ } break; /* Concatenate a character to the end of a string. * function strcatc(name : string, c : char) : string; * * ON INPUT * TOS(st, 0)=character to concatenate * TOS(st, 1)=length of string * TOS(st, 2)=pointer to string * ON OUTPUT * TOS(st, 1)=new length of string * TOS(st, 2)=pointer to string */ case lbSTRCATC : /* Get the parameters from the stack (leaving the string reference * in place. */ POP(st, uparm1); /* Character to concatenate */ uparm2 = TOS(st, 0); /* Current length of string */ /* Check for string overflow. FIXME: This logic does not handle * strings with other than the default size! */ if (uparm2 >= sSTRING_MAX_SIZE) return eSTRSTKOVERFLOW; else { /* Get a pointer to string header, set size new size then, get * a pointer to string data. */ tmp = ((uint16_t*)&GETSTACK(st, TOS(st, 1))) - 1; *tmp++ = uparm2 + 1; dest = (uint8_t*)tmp; /* Add the new charcter */ dest[uparm2] = (uint8_t)uparm1; /* Save the new string size */ TOS(st, 0) = uparm2 + 1; } break; /* Compare two pascal strings * function strcmp(name1 : string, name2 : string) : integer; * ON INPUT * TOS(st, 1)=length of string2 * TOS(st, 2)=address of string2 data * TOS(st, 3)=length of string1 * TOS(st, 4)=address of string1 data * ON OUTPUT * TOS(st, 0)=(-1=less than, 0=equal, 1=greater than} */ case lbSTRCMP : { int result; /* Get the parameters from the stack (leaving space for the * return value); */ POP(st, uparm2); /* length of string2 */ POP(st, addr2); /* address of string2 data */ POP(st, uparm1); /* length of string1 */ addr1 = TOS(st, 0); /* address of string1 data */ /* Get full address */ dest = ATSTACK(st, addr1); src = ATSTACK(st, addr2); /* If name1 is shorter than name2, then we can only return * -1 (less than) or +1 greater than. If the substrings * of length of name1 are equal, then we return less than. */ if (uparm1 < uparm2) { result = memcmp(dest, src, uparm1); if (result == 0) result = -1; } /* If name1 is longer than name2, then we can only return * -1 (less than) or +1 greater than. If the substrings * of length of name2 are equal, then we return greater than. */ else if (uparm1 > uparm2) { result = memcmp(dest, src, uparm2); if (result == 0) result = 1; } /* The strings are of equal length. Return the result of * the comparison. */ else { result = memcmp(dest, src, uparm1); } TOS(st, 0) = result; } break; default : return eBADSYSLIBCALL; } return eNOERROR; } /* end pexec_libcall */ /**************************************************************************** * Name: pexec_execfp * * Description: * This function processes a floating point operation. * ****************************************************************************/ static uint16_t pexec_execfp(struct pexec_s *st, uint8_t fpop) { int16_t intValue; fparg_t arg1; fparg_t arg2; fparg_t result; switch (fpop & fpMASK) { /* Floating Pointer Conversions (On stack argument: FP or Integer) */ case fpFLOAT : POP(st, intValue); result.f = (double)intValue; PUSH(st, result.hw[0]); PUSH(st, result.hw[1]); PUSH(st, result.hw[2]); PUSH(st, result.hw[3]); break; case fpTRUNC : case fpROUND : pexec_getfparguments(st, fpop, &arg1, NULL); intValue = (int16_t)arg1.f; PUSH(st, intValue); break; /* Floating Point arithmetic instructions (Two FP stack arguments) */ case fpADD : pexec_getfparguments(st, fpop, &arg1, &arg2); result.f = arg1.f + arg2.f; PUSH(st, result.hw[0]); PUSH(st, result.hw[1]); PUSH(st, result.hw[2]); PUSH(st, result.hw[3]); break; case fpSUB : pexec_getfparguments(st, fpop, &arg1, &arg2); result.f = arg1.f - arg2.f; PUSH(st, result.hw[0]); PUSH(st, result.hw[1]); PUSH(st, result.hw[2]); PUSH(st, result.hw[3]); break; case fpMUL : pexec_getfparguments(st, fpop, &arg1, &arg2); result.f = arg1.f * arg2.f; PUSH(st, result.hw[0]); PUSH(st, result.hw[1]); PUSH(st, result.hw[2]); PUSH(st, result.hw[3]); break; case fpDIV : pexec_getfparguments(st, fpop, &arg1, &arg2); result.f = arg1.f / arg2.f; PUSH(st, result.hw[0]); PUSH(st, result.hw[1]); PUSH(st, result.hw[2]); PUSH(st, result.hw[3]); break; case fpMOD : return eBADFPOPCODE; #if 0 /* Not yet */ pexec_getfparguments(st, fpop, &arg1, &arg2); result.f = arg1.f % arg2.f; PUSH(st, result.hw[0]); PUSH(st, result.hw[1]); PUSH(st, result.hw[2]); PUSH(st, result.hw[3]); break; #endif /* Floating Point Comparisons (Two FP stack arguments) */ case fpEQU : pexec_getfparguments(st, fpop, &arg1, &arg2); intValue = PFALSE; if (arg1.f == arg2.f) intValue = PTRUE; PUSH(st, intValue); break; case fpNEQ : pexec_getfparguments(st, fpop, &arg1, &arg2); intValue = PFALSE; if (arg1.f != arg2.f) intValue = PTRUE; PUSH(st, intValue); break; case fpLT : pexec_getfparguments(st, fpop, &arg1, &arg2); intValue = PFALSE; if (arg1.f < arg2.f) intValue = PTRUE; PUSH(st, intValue); break; case fpGTE : pexec_getfparguments(st, fpop, &arg1, &arg2); intValue = PFALSE; if (arg1.f >= arg2.f) intValue = PTRUE; PUSH(st, intValue); break; case fpGT : pexec_getfparguments(st, fpop, &arg1, &arg2); intValue = PFALSE; if (arg1.f > arg2.f) intValue = PTRUE; PUSH(st, intValue); break; case fpLTE : pexec_getfparguments(st, fpop, &arg1, &arg2); intValue = PFALSE; if (arg1.f <= arg2.f) intValue = PTRUE; PUSH(st, intValue); break; /* Floating Point arithmetic instructions (One FP stack arguments) */ case fpNEG : pexec_getfparguments(st, fpop, &arg1, NULL); result.f = -arg1.f; PUSH(st, result.hw[0]); PUSH(st, result.hw[1]); PUSH(st, result.hw[2]); PUSH(st, result.hw[3]); break; #ifdef CONFIG_HAVE_LIBM case fpABS : pexec_getfparguments(st, fpop, &arg1, NULL); result.f = fabs(arg1.f); PUSH(st, result.hw[0]); PUSH(st, result.hw[1]); PUSH(st, result.hw[2]); PUSH(st, result.hw[3]); break; #endif case fpSQR : pexec_getfparguments(st, fpop, &arg1, NULL); result.f = arg1.f * arg1.f; PUSH(st, result.hw[0]); PUSH(st, result.hw[1]); PUSH(st, result.hw[2]); PUSH(st, result.hw[3]); break; #ifdef CONFIG_HAVE_LIBM case fpSQRT : pexec_getfparguments(st, fpop, &arg1, NULL); result.f = sqrt(arg1.f); PUSH(st, result.hw[0]); PUSH(st, result.hw[1]); PUSH(st, result.hw[2]); PUSH(st, result.hw[3]); break; case fpSIN : pexec_getfparguments(st, fpop, &arg1, NULL); result.f = sin(arg1.f); PUSH(st, result.hw[0]); PUSH(st, result.hw[1]); PUSH(st, result.hw[2]); PUSH(st, result.hw[3]); break; case fpCOS : pexec_getfparguments(st, fpop, &arg1, NULL); result.f = cos(arg1.f); PUSH(st, result.hw[0]); PUSH(st, result.hw[1]); PUSH(st, result.hw[2]); PUSH(st, result.hw[3]); break; case fpATAN : pexec_getfparguments(st, fpop, &arg1, NULL); result.f = atan(arg1.f); PUSH(st, result.hw[0]); PUSH(st, result.hw[1]); PUSH(st, result.hw[2]); PUSH(st, result.hw[3]); break; case fpLN : pexec_getfparguments(st, fpop, &arg1, NULL); result.f = log(arg1.f); PUSH(st, result.hw[0]); PUSH(st, result.hw[1]); PUSH(st, result.hw[2]); PUSH(st, result.hw[3]); break; case fpEXP : pexec_getfparguments(st, fpop, &arg1, NULL); result.f = exp(arg1.f); PUSH(st, result.hw[0]); PUSH(st, result.hw[1]); PUSH(st, result.hw[2]); PUSH(st, result.hw[3]); break; #endif default : return eBADFPOPCODE; } return eNOERROR; } /* end pexec_execfp */ /**************************************************************************** * Name: pexec_getfparguments * * Description: * This function retrieves the floating point arguments and performs * integer to REAL conversions as necessary * ****************************************************************************/ static void pexec_getfparguments(struct pexec_s *st, uint8_t fpop, fparg_t *arg1, fparg_t *arg2) { int16_t sparm; /* Extract arg2 from the stack */ if (arg2) { /* Convert an integer argument to type REAL */ if ((fpop & fpARG2) != 0) { POP(st, sparm); arg2->f = (double)sparm; } else { POP(st, arg2->hw[3]); POP(st, arg2->hw[2]); POP(st, arg2->hw[1]); POP(st, arg2->hw[0]); } } /* Extract arg1 from the stack */ if (arg1) { /* Convert an integer argument to type REAL */ if ((fpop & fpARG1) != 0) { POP(st, sparm); arg1->f = (double)sparm; } else { POP(st, arg1->hw[3]); POP(st, arg1->hw[2]); POP(st, arg1->hw[1]); POP(st, arg1->hw[0]); } } } /* end pexec_getfparguments */ /**************************************************************************** * Name: pexec_readinteger * * Description: * This function parses a decimal integer from ioptr ****************************************************************************/ static ustack_t pexec_readinteger(uint8_t *ioptr) { sstack_t value = 0; while (isspace(*ioptr)) ioptr++; while ((*ioptr >= '0') && (*ioptr <= '9')) { value = 10*value + (sstack_t)(*ioptr) - (sstack_t)'0'; ioptr++; } return (ustack_t)value; } /* end pexec_readinteger */ /**************************************************************************** * Name: pexec_readreal * * Description: * This function parses a decimal integer from ioptr. * ****************************************************************************/ static void pexec_readreal(uint16_t *dest, uint8_t *inPtr) { int32_t intpart; fparg_t result; double fraction; uint8_t unaryop; intpart = 0; unaryop = '+'; /* Check for a leading unary - */ if ((*inPtr == '-') || (*inPtr == '+')) unaryop = *inPtr++; /* Get the integer part of the real */ while ((*inPtr >= '0') && (*inPtr <= '9')) intpart = 10*intpart + ((int32_t)*inPtr++) - ((int32_t)'0'); result.f = ((double)intpart); /* Check for the a fractional part */ if (*inPtr == '.') { inPtr++; fraction = 0.1; while ((*inPtr >= '0') && (*inPtr <= '9')) { result.f += fraction * (double)(((int32_t)*inPtr++) - ((int32_t)'0')); fraction /= 10.0; } } /* Correct the sign of the result */ if (unaryop == '-') result.f = -result.f; /* Return the value into the P-Machine stack */ *dest++ = result.hw[0]; *dest++ = result.hw[1]; *dest++ = result.hw[2]; *dest = result.hw[3]; } /* end pexec_readreal */ /**************************************************************************** * Name: pexec_getbaseaddress * * Description: * This function binds the base address corresponding to a given level * offset. * ****************************************************************************/ static ustack_t pexec_getbaseaddress(struct pexec_s *st, level_t leveloffset) { /* Start with the base register of the current frame */ ustack_t baseAddress = st->fp; /* Search backware "leveloffset" frames until the correct frame is * found */ while (leveloffset > 0) { baseAddress = st->dstack.i[BTOISTACK(baseAddress)]; leveloffset--; } /* Offset that value by two words (one for the st->fp and one for the * return value */ return baseAddress + 2*BPERI; } /* end pexec_getbaseaddress */ /**************************************************************************** * Name: pexec_mkcstring ****************************************************************************/ static uint8_t *pexec_mkcstring(uint8_t *buffer, int buflen) { uint8_t *string; string = malloc(buflen + 1); if (string != NULL) { memcpy(string, buffer, buflen); string[buflen] = '\0'; } return string; } /**************************************************************************** * Name: pexec8 * * Descripton: * Handle 8-bit instructions with no immediate data * ****************************************************************************/ static inline int pexec8(FAR struct pexec_s *st, uint8_t opcode) { sstack_t sparm; ustack_t uparm1; ustack_t uparm2; ustack_t uparm3; switch (opcode) { /* Arithmetic & logical & and integer conversions (One stack argument) */ case oNEG : TOS(st, 0) = (ustack_t)(-(sstack_t)TOS(st, 0)); break; case oABS : if (signExtend16(TOS(st, 0)) < 0) { TOS(st, 0) = (ustack_t)(-signExtend16(TOS(st, 0))); } break; case oINC : TOS(st, 0)++; break; case oDEC : TOS(st, 0)--; break; case oNOT : TOS(st, 0) = ~TOS(st, 0); break; /* Arithmetic & logical (Two stack arguments) */ case oADD : POP(st, sparm); TOS(st, 0) = (ustack_t)(((sstack_t)TOS(st, 0)) + sparm); break; case oSUB : POP(st, sparm); TOS(st, 0) = (ustack_t)(((sstack_t)TOS(st, 0)) - sparm); break; case oMUL : POP(st, sparm); TOS(st, 0) = (ustack_t)(((sstack_t)TOS(st, 0)) * sparm); break; case oDIV : POP(st, sparm); TOS(st, 0) = (ustack_t)(((sstack_t)TOS(st, 0)) / sparm); break; case oMOD : POP(st, sparm); TOS(st, 0) = (ustack_t)(((sstack_t)TOS(st, 0)) % sparm); break; case oSLL : POP(st, sparm); TOS(st, 0) = (ustack_t)(((sstack_t)TOS(st, 0)) << sparm); break; case oSRL : POP(st, sparm); TOS(st, 0) = (TOS(st, 0) >> sparm); break; case oSRA : POP(st, sparm); TOS(st, 0) = (ustack_t)(((sstack_t)TOS(st, 0)) >> sparm); break; case oOR : POP(st, uparm1); TOS(st, 0) = (TOS(st, 0) | uparm1); break; case oAND : POP(st, uparm1); TOS(st, 0) = (TOS(st, 0) & uparm1); break; case oBIT : POP(st, uparm1); uparm2 = TOS(st, 0); if ((uparm1 & (1 << uparm2)) != 0) { TOS(st, 0) = PTRUE; } else { TOS(st, 0) = PFALSE; } break; /* Comparisons (One stack argument) */ case oEQUZ : POP(st, sparm); uparm1 = PFALSE; if (sparm == 0) { uparm1 = PTRUE; } PUSH(st, uparm1); break; case oNEQZ : POP(st, sparm); uparm1 = PFALSE; if (sparm != 0) { uparm1 = PTRUE; } PUSH(st, uparm1); break; case oLTZ : POP(st, sparm); uparm1 = PFALSE; if (sparm < 0) { uparm1 = PTRUE; } PUSH(st, uparm1); break; case oGTEZ : POP(st, sparm); uparm1 = PFALSE; if (sparm >= 0) { uparm1 = PTRUE; } PUSH(st, uparm1); break; case oGTZ : POP(st, sparm); uparm1 = PFALSE; if (sparm > 0) { uparm1 = PTRUE; } PUSH(st, uparm1); break; case oLTEZ : POP(st, sparm); uparm1 = PFALSE; if (sparm <= 0) { uparm1 = PTRUE; } PUSH(st, uparm1); break; /* Comparisons (Two stack arguments) */ case oEQU : POP(st, sparm); uparm1 = PFALSE; if (sparm == (sstack_t)TOS(st, 0)) { uparm1 = PTRUE; } TOS(st, 0) = uparm1; break; case oNEQ : POP(st, sparm); uparm1 = PFALSE; if (sparm != (sstack_t)TOS(st, 0)) { uparm1 = PTRUE; } TOS(st, 0) = uparm1; break; case oLT : POP(st, sparm); uparm1 = PFALSE; if (sparm < (sstack_t)TOS(st, 0)) { uparm1 = PTRUE; } TOS(st, 0) = uparm1; break; case oGTE : POP(st, sparm); uparm1 = PFALSE; if (sparm >= (sstack_t)TOS(st, 0)) { uparm1 = PTRUE; } TOS(st, 0) = uparm1; break; case oGT : POP(st, sparm); uparm1 = PFALSE; if (sparm > (sstack_t)TOS(st, 0)) { uparm1 = PTRUE; } TOS(st, 0) = uparm1; break; case oLTE : POP(st, sparm); uparm1 = PFALSE; if (sparm <= (sstack_t)TOS(st, 0)) { uparm1 = PTRUE; } TOS(st, 0) = uparm1; break; /* Load (One stack argument) */ case oLDI : POP(st, uparm1); /* Address */ PUSH(st, GETSTACK(st, uparm1)); PUSH(st, GETSTACK(st, uparm1 + BPERI)); break; case oLDIH : TOS(st, 0) = GETSTACK(st, TOS(st, 0)); break; case oLDIB : TOS(st, 0) = GETBSTACK(st, TOS(st, 0)); break; case oLDIM : /* FIX ME --> Need to handle the unaligned case */ POP(st, uparm1); /* Size */ POP(st, uparm2); /* Stack offset */ while (uparm1 > 0) { if (uparm1 >= BPERI) { PUSH(st, GETSTACK(st, uparm2)); uparm2 += BPERI; uparm1 -= BPERI; } else { PUSH(st, GETBSTACK(st, uparm2)); uparm2++; uparm1--; } } break; case oDUP : uparm1 = TOS(st, 0); uparm2 = TOS(st, 1); PUSH(st, uparm2); PUSH(st, uparm1); break; case oDUPH : uparm1 = TOS(st, 0); PUSH(st, uparm1); break; case oPUSHS : PUSH(st, st->csp); break; case oPOPS : POP(st, st->csp); break; /* Store (Two stack arguments) */ case oSTIH : POP(st, uparm1); POP(st, uparm2); PUTSTACK(st, uparm1,uparm2); break; case oSTIB : POP(st, uparm1); POP(st, uparm2); PUTBSTACK(st, uparm1, uparm2); break; case oSTIM : /* FIX ME --> Need to handle the unaligned case */ POP(st, uparm1); /* Size in bytes */ uparm3 = uparm1; /* Save for stack discard */ sparm = ROUNDBTOI(uparm1); /* Size in words */ uparm2 = TOS(st, sparm); /* Stack offset */ sparm--; while (uparm1 > 0) { if (uparm1 >= BPERI) { PUTSTACK(st, TOS(st, sparm), uparm2); uparm2 += BPERI; uparm1 -= BPERI; sparm--; } else { PUTBSTACK(st, TOS(st, sparm), uparm2); uparm2++; uparm1--; } } /* Discard the stored data + the stack offset */ DISCARD(st, (ROUNDBTOI(uparm3) + 1)); break; /* Program control (No stack arguments) */ case oNOP : break; case oRET : POP(st, st->pc); POP(st, st->fp); DISCARD(st, 1); return eNOERROR; /* System Functions (No stack arguments) */ case oEND : return eEXIT; default : return eILLEGALOPCODE; } st->pc += 1; return eNOERROR; } /**************************************************************************** * Name: pexec16 * * Descripton: * Handle 16-bit instructions with 8-bits of immediate data (imm8) * ****************************************************************************/ static inline int pexec16(FAR struct pexec_s *st, uint8_t opcode, uint8_t imm8) { int ret = eNOERROR; st->pc += 2; switch (opcode) { /* Data stack: imm8 = 8 bit unsigned data (no stack arguments) */ case oPUSHB : PUSH(st, imm8); break; /* Floating Point: imm8 = FP op-code (varying number of stack arguments) */ case oFLOAT : ret = pexec_execfp(st, imm8); break; default : ret = eILLEGALOPCODE; break; } return ret; } /**************************************************************************** * Name: pexec24 * * Descripton: * Handle 24-bit instructions with 16-bits of immediate data (imm16) * ****************************************************************************/ static inline int pexec24(FAR struct pexec_s *st, uint8_t opcode, uint16_t imm16) { sstack_t sparm1; sstack_t sparm2; ustack_t uparm1; ustack_t uparm2; ustack_t uparm3; int ret = eNOERROR; switch (opcode) { /* Program control: imm16 = unsigned label (no stack arguments) */ case oJMP : goto branch_out; /* Program control: imm16 = unsigned label (One stack argument) */ case oJEQUZ : POP(st, sparm1); if (sparm1 == 0) { goto branch_out; } break; case oJNEQZ : POP(st, sparm1); if (sparm1 != 0) { goto branch_out; } break; case oJLTZ : POP(st, sparm1); if (sparm1 < 0) { goto branch_out; } break; case oJGTEZ : POP(st, sparm1); if (sparm1 >= 0) { goto branch_out; } break; case oJGTZ : POP(st, sparm1); if (sparm1 > 0) { goto branch_out; } break; case oJLTEZ : POP(st, sparm1); if (sparm1 <= 0) { goto branch_out; } break; /* Program control: imm16 = unsigned label (Two stack arguments) */ case oJEQU : POP(st, sparm1); POP(st, sparm2); if (sparm2 == sparm1) { goto branch_out; } break; case oJNEQ : POP(st, sparm1); POP(st, sparm2); if (sparm2 != sparm1) { goto branch_out; } break; case oJLT : POP(st, sparm1); POP(st, sparm2); if (sparm2 < sparm1) { goto branch_out; } break; case oJGTE : POP(st, sparm1); POP(st, sparm2); if (sparm2 >= sparm1) { goto branch_out; } break; case oJGT : POP(st, sparm1); POP(st, sparm2); if (sparm2 > sparm1) { goto branch_out; } break; case oJLTE : POP(st, sparm1); POP(st, sparm2); if (sparm2 <= sparm1) { goto branch_out; } break; /* Load: imm16 = usigned offset (no stack arguments) */ case oLD : uparm1 = st->spb + imm16; PUSH(st, GETSTACK(st, uparm1)); PUSH(st, GETSTACK(st, uparm1 + BPERI)); break; case oLDH : uparm1 = st->spb + imm16; PUSH(st, GETSTACK(st, uparm1)); break; case oLDB : uparm1 = st->spb + imm16; PUSH(st, GETBSTACK(st, uparm1)); break; case oLDM : /* FIX ME --> Need to handle the unaligned case */ POP(st, uparm1); uparm2 = st->spb + imm16; while (uparm1 > 0) { if (uparm1 >= BPERI) { PUSH(st, GETSTACK(st, uparm2)); uparm2 += BPERI; uparm1 -= BPERI; } else { PUSH(st, GETBSTACK(st, uparm2)); uparm2++; uparm1--; } } break; /* Load & store: imm16 = unsigned base offset (One stack argument) */ case oST : uparm1 = st->spb + imm16; POP(st, uparm2); PUTSTACK(st, uparm2, uparm1 + BPERI); POP(st, uparm2); PUTSTACK(st, uparm2, uparm1); break; case oSTH : uparm1 = st->spb + imm16; POP(st, uparm2); PUTSTACK(st, uparm2, uparm1); break; case oSTB : uparm1 = st->spb + imm16; POP(st, uparm2); PUTBSTACK(st, uparm2, uparm1); break; case oSTM : /* FIX ME --> Need to handle the unaligned case */ POP(st, uparm1); /* Size */ uparm3 = uparm1; /* Save for stack discard */ uparm2 = st->spb + imm16; sparm1 = ROUNDBTOI(uparm1) - 1; while (uparm1 > 0) { if (uparm1 >= BPERI) { PUTSTACK(st, TOS(st, sparm1), uparm2); uparm2 += BPERI; uparm1 -= BPERI; sparm1--; } else { PUTBSTACK(st, TOS(st, sparm1), uparm2); uparm2++; uparm1--; } } /* Discard the stored data */ DISCARD(st, ROUNDBTOI(uparm3)); break; case oLDX : uparm1 = st->spb + imm16 + TOS(st, 0); TOS(st, 0) = GETSTACK(st, uparm1); PUSH(st, GETSTACK(st, uparm1 + BPERI)); break; case oLDXH : uparm1 = st->spb + imm16 + TOS(st, 0); TOS(st, 0) = GETSTACK(st, uparm1); break; case oLDXB : uparm1 = st->spb + imm16 + TOS(st, 0); TOS(st, 0) = GETBSTACK(st, uparm1); break; case oLDXM : /* FIX ME --> Need to handle the unaligned case */ POP(st, uparm1); POP(st, uparm2); uparm2 += st->spb + imm16; while (uparm1 > 0) { if (uparm1 >= BPERI) { PUSH(st, GETSTACK(st, uparm2)); uparm2 += BPERI; uparm1 -= BPERI; } else { PUSH(st, GETBSTACK(st, uparm2)); uparm2++; uparm1--; } } break; /* Store: imm16 = unsigned base offset (Two stack arguments) */ case oSTXH : POP(st, uparm1); POP(st, uparm2); uparm2 += st->spb + imm16; PUTSTACK(st, uparm1,uparm2); break; case oSTXB : POP(st, uparm1); POP(st, uparm2); uparm2 += st->spb + imm16; PUTBSTACK(st, uparm1, uparm2); break; case oSTXM : /* FIX ME --> Need to handle the unaligned case */ POP(st, uparm1); /* Size */ uparm3 = uparm1; /* Save for stack discard */ sparm1 = ROUNDBTOI(uparm1); /* Size in 16-bit words */ uparm2 = TOS(st, sparm1); /* index */ sparm1--; uparm2 += st->spb + imm16; while (uparm1 > 0) { if (uparm1 >= BPERI) { PUTSTACK(st, TOS(st, sparm1), uparm2); uparm2 += BPERI; uparm1 -= BPERI; sparm1--; } else { PUTBSTACK(st, TOS(st, sparm1), uparm2); uparm2++; uparm1--; } } /* Discard the stored data + the index */ DISCARD(st, (ROUNDBTOI(uparm3) + 1)); break; case oLA : uparm1 = st->spb + imm16; PUSH(st, uparm1); break; case oLAX : TOS(st, 0) = st->spb + imm16 + TOS(st, 0); break; /* Data stack: imm16 = 16 bit signed data (no stack arguments) */ case oPUSH : PUSH(st, imm16); break; case oINDS : st->sp += signExtend16(imm16); break; /* System Functions: * For LIB: imm16 = sub-function code */ case oLIB : ret = pexec_libcall(st, imm16); break; /* Program control: imm16 = unsigned label (no stack arguments) */ case oLAC : uparm1 = imm16 + st->rop; PUSH(st, uparm1); break; case oLABEL : default: ret = eILLEGALOPCODE; break; } st->pc += 3; return ret; branch_out: st->pc = (paddr_t)imm16; return ret; } /**************************************************************************** * Name: pexec32 * * Descripton: * Handle 32-bit instructions with 24-bits of immediate data (imm8+imm16) * ****************************************************************************/ static int pexec32(FAR struct pexec_s *st, uint8_t opcode, uint8_t imm8, uint16_t imm16) { sstack_t sparm; ustack_t uparm1; ustack_t uparm2; ustack_t uparm3; int ret = eNOERROR; switch (opcode) { /* Load: imm8 = level; imm16 = signed frame offset (no stack arguments) */ case oLDS : uparm1 = pexec_getbaseaddress(st, imm8) + signExtend16(imm16); PUSH(st, GETSTACK(st, uparm1)); PUSH(st, GETSTACK(st, uparm1 + BPERI)); break; case oLDSH : uparm1 = pexec_getbaseaddress(st, imm8) + signExtend16(imm16); PUSH(st, GETSTACK(st, uparm1)); break; case oLDSB : uparm1 = pexec_getbaseaddress(st, imm8) + signExtend16(imm16); PUSH(st, GETBSTACK(st, uparm1)); break; case oLDSM : /* FIX ME --> Need to handle the unaligned case */ POP(st, uparm1); uparm2 = pexec_getbaseaddress(st, imm8) + signExtend16(imm16); while (uparm1 > 0) { if (uparm1 >= BPERI) { PUSH(st, GETSTACK(st, uparm2)); uparm2 += BPERI; uparm1 -= BPERI; } else { PUSH(st, GETBSTACK(st, uparm2)); uparm2++; uparm1--; } } break; /* Load & store: imm8 = level; imm16 = signed frame offset (One stack argument) */ case oSTSH : uparm1 = pexec_getbaseaddress(st, imm8) + signExtend16(imm16); POP(st, uparm2); PUTSTACK(st, uparm2, uparm1); break; case oSTSB : uparm1 = pexec_getbaseaddress(st, imm8) + signExtend16(imm16); POP(st, uparm2); PUTBSTACK(st, uparm2, uparm1); break; case oSTSM : /* FIX ME --> Need to handle the unaligned case */ POP(st, uparm1); /* Size */ uparm3 = uparm1; /* Save for stack discard */ uparm2 = pexec_getbaseaddress(st, imm8) + signExtend16(imm16); sparm = ROUNDBTOI(uparm1) - 1; while (uparm1 > 0) { if (uparm1 >= BPERI) { PUTSTACK(st, TOS(st, sparm), uparm2); uparm2 += BPERI; uparm1 -= BPERI; sparm--; } else { PUTBSTACK(st, TOS(st, sparm), uparm2); uparm2++; uparm1--; } } /* Discard the stored data */ DISCARD(st, ROUNDBTOI(uparm3)); break; case oLDSX : uparm1 = pexec_getbaseaddress(st, imm8) + signExtend16(imm16) + TOS(st, 0); TOS(st, 0) = GETSTACK(st, uparm1); PUSH(st, GETSTACK(st, uparm1 + BPERI)); break; case oLDSXH : uparm1 = pexec_getbaseaddress(st, imm8) + signExtend16(imm16) + TOS(st, 0); TOS(st, 0) = GETSTACK(st, uparm1); break; case oLDSXB : uparm1 = pexec_getbaseaddress(st, imm8) + signExtend16(imm16) + TOS(st, 0); TOS(st, 0) = GETBSTACK(st, uparm1); break; case oLDSXM : /* FIX ME --> Need to handle the unaligned case */ POP(st, uparm1); POP(st, uparm2); uparm2 += pexec_getbaseaddress(st, imm8) + signExtend16(imm16); while (uparm1 > 0) { if (uparm1 >= BPERI) { PUSH(st, GETSTACK(st, uparm2)); uparm2 += BPERI; uparm1 -= BPERI; } else { PUSH(st, GETBSTACK(st, uparm2)); uparm2++; uparm1--; } } break; /* Store: imm8 = level; imm16 = signed frame offset (Two stack arguments) */ case oSTSXH : POP(st, uparm1); POP(st, uparm2); uparm2 += pexec_getbaseaddress(st, imm8) + signExtend16(imm16); PUTSTACK(st, uparm1,uparm2); break; case oSTSXB : POP(st, uparm1); POP(st, uparm2); uparm2 += pexec_getbaseaddress(st, imm8) + signExtend16(imm16); PUTBSTACK(st, uparm1, uparm2); break; case oSTSXM : /* FIX ME --> Need to handle the unaligned case */ POP(st, uparm1); /* Size */ uparm3 = uparm1; /* Save for stack discard */ sparm = ROUNDBTOI(uparm1); /* Size in 16-bit words */ uparm2 = TOS(st, sparm); /* index */ sparm--; uparm2 += pexec_getbaseaddress(st, imm8) + signExtend16(imm16); while (uparm1 > 0) { if (uparm1 >= BPERI) { PUTSTACK(st, TOS(st, sparm), uparm2); uparm2 += BPERI; uparm1 -= BPERI; sparm--; } else { PUTBSTACK(st, TOS(st, sparm), uparm2); uparm2++; uparm1--; } } /* Discard the stored data + the index */ DISCARD(st, (ROUNDBTOI(uparm3) + 1)); break; case oLAS : uparm1 = pexec_getbaseaddress(st, imm8) + signExtend16(imm16); PUSH(st, uparm1); break; case oLASX : TOS(st, 0) = pexec_getbaseaddress(st, imm8) + signExtend16(imm16) + TOS(st, 0); break; /* Program Control: imm8 = level; imm16 = unsigned label (No * stack arguments) */ case oPCAL : PUSH(st, pexec_getbaseaddress(st, imm8)); PUSH(st, st->fp); uparm1 = st->sp; PUSH(st, st->pc + 4); st->fp = uparm1; st->pc = (paddr_t)imm16; return eNOERROR; /* System Functions: * For SYSIO: imm8 = file number; imm16 = sub-function code */ case oSYSIO : ret = pexec_sysio(st, imm8, imm16); break; /* Psuedo-operations: (No stack arguments) * For LINE: imm8 = file number; imm16 = line number */ case oLINE : default : ret = eILLEGALOPCODE; break; } st->pc += 4; return ret; } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: pexec_init ****************************************************************************/ FAR struct pexec_s *pexec_init(struct pexec_attr_s *attr) { struct pexec_s *st; paddr_t stacksize; paddr_t adjusted_rosize; /* Allocate the p-machine state stucture */ st = (struct pexec_s *)malloc(sizeof(struct pexec_s)); if (!st) { return NULL; } /* Set up I-Space */ st->ispace = attr->ispace; st->maxpc = attr->maxpc; /* Align size of read-only data to 16-bit boundary. */ adjusted_rosize = (attr->rosize + 1) & ~1; /* Allocate the pascal stack. Organization is string stack, then * constant data, then "normal" pascal stack. */ stacksize = attr->varsize + adjusted_rosize + attr->strsize; st->dstack.b = (uint8_t*)malloc(stacksize); if (!st->dstack.b) { free(st); return NULL; } /* Copy the rodata into the stack */ if (attr->rodata && attr->rosize) { memcpy(&st->dstack.b[attr->strsize], attr->rodata, attr->rosize); } /* Set up info needed to perform a simulated reset */ st->strsize = attr->strsize; st->rosize = adjusted_rosize; st->entry = attr->entry; st->stacksize = stacksize; /* Then perform a simulated reset */ pexec_reset(st); return st; } /**************************************************************************** * Name: pexec ****************************************************************************/ int pexec(FAR struct pexec_s *st) { uint8_t opcode; int ret; /* Make sure that the program counter is within range */ if (st->pc >= st->maxpc) { ret = eBADPC; } else { /* Get the instruction to execute */ opcode = st->ispace[st->pc]; if ((opcode & o8) != 0) { /* Get the immediate, 8-bit value */ uint8_t imm8 = st->ispace[st->pc + 1]; if ((opcode & o16) != 0) { /* Get the immediate, big-endian 16-bit value */ uint16_t imm16 = ((st->ispace[st->pc + 2]) << 8) | st->ispace[st->pc + 3]; /* Handle 32 bit instructions */ ret = pexec32(st, opcode, imm8, imm16); } else { /* Handle 16-bit instructions */ ret = pexec16(st, opcode, imm8); } } else if ((opcode & o16) != 0) { /* Get the immediate, big-endian 16-bit value */ uint16_t imm16 = ((st->ispace[st->pc + 1]) << 8) | st->ispace[st->pc + 2]; /* Handle 24-bit instructions */ ret = pexec24(st, opcode, imm16); } else { /* Handle 8-bit instructions */ ret = pexec8(st, opcode); } } return ret; } /**************************************************************************** * Name: pexec_reset ****************************************************************************/ void pexec_reset(struct pexec_s *st) { int dndx; /* Setup the bottom of the "normal" pascal stack */ st->rop = st->strsize; st->spb = st->strsize + st->rosize; /* Initialize the emulated P-Machine registers */ st->csp = 0; st->sp = st->spb + 2*BPERI; st->fp = st->spb + BPERI; st->pc = st->entry; /* Initialize the P-Machine stack */ dndx = BTOISTACK(st->spb); st->dstack.i[dndx] = 0; st->dstack.i[dndx+1] = 0; st->dstack.i[dndx+2] = -1; } /**************************************************************************** * Name: pexec_release ****************************************************************************/ void pexec_release(struct pexec_s *st) { if (st) { if (st->dstack.i) { free(st->dstack.i); } if (st->ispace) { free(st->ispace); } free(st); } }